Liquid Silicone Viscosity Selection Guide
Introduction
1. Low Viscosity 1,000–8,000 cps | Casting
Features: Great self-leveling & defoaming, fills tiny textures down to 0.1mm.
Uses: Baking molds, resin crafts, jewelry prototypes.
Note: Not for vertical brushing — will sag and leak.
2. Medium-High Thixotropic 15,000–50,000 cps | Brush Molding
Features: Stays vertical without dripping; layerable for thick molds.
Uses: Sculptures, cement & large decorative molds.
Note: Too thin causes sagging; too thick leaves brush marks.
3. Ultra-High Viscosity ≥80,000 cps | Calendering
Features: Firm consistency, non-sticky to rollers, uniform sheet output.
Uses: Silicone sheets, waterproof rolls, gaskets mass production.
Note: Poor flow, only for calender equipment.
4. Custom LSR Injection Silicone | Automatic Injection
Features: Balanced fluidity, fast high-temperature curing, food-safe (FDA/GB4806/SGS).
Uses: Pacifiers, seals, electronic keypads, medical silicone parts.
Note: Exclusive for injection machines; not interchangeable with casting silicone.
General Tips
- Low temperature raises viscosity; hot weather thins silicone.
- Colorants/fillers thicken silicone, reserve viscosity margin.
- Test samples before bulk purchase for best results.
Summary
- Small fine molds: Low-viscosity casting silicone
- Large vertical molds: Thixotropic brush silicone
- Continuous sheet production: Ultra-high viscosity calendering silicone
- Mass precision parts: Custom LSR injection silicone
Short Social Media Version
- 1,000–8,000 cps: Casting, bubble-free fine detail
- 15,000–50,000 cps: Brush mold, no sagging on vertical surfaces
- ≥80,000 cps: Calendering for even silicone sheets
- Custom LSR: Automated injection for food & medical silicone products
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